<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <div id="div1" class="box">div1(class="box")</div>
    <div id="div2" class="box">div2(class="box")</div>
    <div id="div3">div3</div>
    <span class="box">span(class="box")</span>

    <br>

    <ul>
        <li>AAAAAA</li>
        <li title="hello">BBBBBB(title="hello")</li>
        <li class="box">CCCCCC(class="box")</li>
        <li title="hello">DDDDDD(title="hello)</li>
    </ul>

    <script src="js/jquery-3.5.1.min.js"></script>
    <script>
        // $('#div1').css('color','red')
        // $('.box').css('background','blue')
        // $('div').css('color','green')
        // $('div,span').css('color','red')
        // $('div.box').css('font-size','22px')


        $('ul span').css 
    </script>
</body>
</html>